Improvement in metal-coating compositions



'rnn STATES ATENT EDWARD J. W. BURRAS, OF PARISH OF LAMBETH, ENGLAND,ASSIGNOR OF ONEHALF HIS RIGHT TO GEORGE G. BREWER, OF BALTIMORE, MD.

IMPROVEMENT lN METAL-COATING COMPOSITIONS.

Specification forming part of Letters Patent No. 158,902, dated January19, 1875; application filed December 26, 1874.

as a paint, and which will set and form a protective coating which willstand the ordinary usage to which such surfaces may be subjected, butwhich may be conveniently removed, when desired, by means of naphtha,turpentine, or equivalent substances, as will be fully hereinafter setforth. 9

My invention is particularly designed for 1 the protection of all brightmetallic surfaces liable to oxidation or corrosion, where it is notdesirable to apply a permanent paint, such as the metallic portions ofseagoing vessels, silver or plated ware, and other metallic articlesthat are to be laid aside for a time, which are required in theiroriginal bright condition when in use.

My invention consists in a composition of chalk or whiting, china clayor kaolin, calcined sulphate of iron, copper, zinc, or other well-knowndrier, refuse fat, and linseed-oil, the whole being brought to properconsistency by means of naphtha, turpentine, or equivalent diluent, thesolid ingredients being finely comminuted by grinding, audthe wholethoroughly incorporated by means of heat.

The above ingredients may be mixed in various proportions, according tothe nature of the surfaces to which it is to be applied, and thetemperature to which the articles may be subjected. For most purposesthe following proportions will answer etfectively, viz:

To a ton of two thousand pounds, twelve hundred pounds of chalk orwhiting; ninetynine pounds of china clay or kaolin; one pound ofsulphate of iron or other drier; seven hundred pounds of refuse fat.

which is only fit for the manufacture of the inferior varieties of softsoap, and which can be obtained at a small expense.

The composition as thus formed is, at ordinary temperatures, of aboutthe consistency of the ordinary glaziers putty. It may be packed incanisters of any desired sizesay, twenty-eight pounds, for instanceormay be formed into bars or cakes, and placed in the market.

It is applied by heating it to about 212 Fahrenheit, by placing it inthe can or other suitable vessel until melted, and then-laid on by meansof a brush, or in any other convenient manner. In a few hours it willset, forming a coating having the appearance of white paint, which willefi'ectually prevent injury to the metal from oxidation or the action ofcorrosive agents. It is a most effective coating for metallic s'ea-going vessels, and may be applied to the bottoms of the same, and thevarious other metallic parts. Vessels thus coated will be entirely freefrom barnacles and other parasites which usually collect on theirbottoms during a voyage, and all the metallic parts of the same will bepreserved in their original bright condition, it only being necessary onarrival at port to rub off the composition by means of a rag saturatedwith naphtha, turpentine, or equivalent substance.

Various metallic articles which are put by for use can be maintained ina bright condition for any period of time by coating with thecomposition, such as silver ware and plated ware, for instance, as nocorrosion can possibly take place, as the compound resists the action ofacids and all the ordinary chemical reagents.

To restore them to their original beauty and FFIGE.

polish, it is only necessary to remove the composition, as abovedescribed, which can be done at very little expense, and in a shorttime.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

A composition, consisting of chalk, china clay or kaolin, sulphate ofiron, copper, or zinc, refuse fat, and linseed-oil or naphtha,

substantially as described, for coating various metallic surfaces toprevent oxidation and corrosion, as set forth.

In testimony that I claim the foregoing I have hereunto set my hand.

EDWARD J. W. BURRAS.

Witnesses:

JAMES L. NORRIS, GEO. W. OUSHING, Jr.

